Malicious PDF — malware analysis report

Static analysis result for SHA-256 45391ef923191470…

MALICIOUS

PDF

75.1 KB Created: 2021-04-29 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8c2ba7a6d2ce53ceee502a03501d7297 SHA-1: d823dc91c7b930ad0e578e8e76b83a5e7e2f7848 SHA-256: 45391ef923191470aeaeca6ca047c4a97cbfd90a31714415c741e2e0fcc92715
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious sites. The primary redirector URL, 'https://ponafet.ru/strik?utm_term=how+do+you+check+transmission+oil+level', suggests a phishing lure related to common search queries. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=how+do+you+check+transmission+oil+level PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454545/normal_60414e54bddbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fccf35369662.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/0e0ba0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479923/normal_5ff9f6873dac3.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/9726036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_6066fe7443ab1.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/3334216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_6005f550ae65a.pdfIn PDF document text
    • https://derigibi.weebly.com/uploads/1/3/4/4/134447264/b5e7aaa33.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/tonalademumudumalem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474989/normal_6003eeefac553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473651/normal_5fef494bbfa42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuzavaxevarap.epizy.com/chhello_divas_full_movie_khatrimaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9269dec6-e1d9-434a-b53b-d3fe2bdbcc5b/bulisop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71dc25f2-c73c-436c-8723-4bf5bb8257db/why_wont_my_printer_feed_the_paper.pdfIn PDF document text
    • http://losaxoxajav.epizy.com/fuwovupawuzigopagisapugo.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_3f9d96d9a2ab469fb697ce199f77c1d9.pdf?index=trueIn PDF document text
    • http://tuzawuza.epizy.com/tuzagevu.pdfIn PDF document text
    • http://fegozovot.rf.gd/warhammer_40_000_codex.pdfIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_1a088d8829a849aca6aaffc869503c9f.pdf?index=trueIn PDF document text
    • http://dirunexodov.rf.gd/what_is_quantum_physics_for_beginners.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EB 5460 bytes
SHA-256: cc020d59fa910479cba0fcdfb5f971dab151e244f04fac9288d9ba7d38767e46
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 10124 bytes
SHA-256: 87cba1121aa6791e05ca388be7fa7032a17ea136fa9c34a0ce16d74461521f04